lawrence



(No Model.)

HL.. P. LAWRENCE. POWER BRAKE.

No. 418,574. Patented Dec. 31, 1889.

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i' UNITED.' STATES PATENT EGEEICE. i

LOUIS R LAWRENCE, OE PAssAIC, NEW JERSEY, AssIGNOR To Tg1-1E' LAw RENCERAILWAY BRAKE COMPANY, OE NEW YORK, N. Y.

BRAKE.

SPECIFICATION formingpart of Letters Patent No. 418,574, dated December31, 1889.

Application tiled May 23,1889.

To all whom it may concern:

Be it known that I, Louis P. LAWRENCE, of

-Passaic, in the county of Passaic, State of New Jersey, a citizen ofthe United States, have invented certain new and useful Improvements inPower-Brakes, of which the following is a speciication.

This invention relates to improvements in that class of power-brakesthat are operated by vacuum or compressed air, steam, gas, or any othersuitable operating-duid.

The Object of my invention. is to provide a brake of this kind which issimple in construction and powerful, and which can be secured on thebrake-beams and supported by the same. t

The invention consists in the construction and combination of parts anddetails, as will be fully described and set forth hereinafter, andpointed out in the claims.

In the accompanying drawings, Figure 1 is a longitudinal verticalsectional View of a car-truck having the brake-beams at the ends and myimproved power-brake on said beams. Fig. 2 is a similar view showing .amodified construction. Fig. 3 is a similar view of a truck having thebrake-beams at the interior, and also provided with my improvedpower-brake.

Similar letters of reference indicate corresponding parts.

In the construction shown in Fig. 1 the brake-beams A A are arranged atthe ends, as is customary in trucks for passenger,mai1, and expresscars. On the top edge of one of said brake-beams the cylinder B isfixed, which contains the piston C, having the piston-rod D, which isconnected by a link E with the upper end of a lever F, fulcrumed on theouter side of the brake-beam carrying the cylinder. The lower end of thelever F is connected by a rod G with l-the opposite brake-beam A. Thecylinder B has two pipes a d atits ends.

When the brake is to be operated by compressed air, the same is admittedinto the cylinder through the pipe a', and moves the pis-. ton in thedirection of the arrow Qc', whereby the rod G is drawn in the directionof the arrow ar, and the shoes on the brake-beam, with which said rod Gis connected, are pressed Serial No. 311,807. (No model.)

firmly against the corresponding wheels. The shoes on the brake-beamwhich supports the cylinder are also compressed against thecorresponding wheels. By means of the fulcrumed lever G the power ismultiplied according to the dierence in length of the two arms of saidAlever.

In case the brake is to be operated by vacuum, the pipe a is connectedwith the ejector or air-pump, and when the vacuum is created the pistonC is also moved in the direction of the arrow In Fig. 2 the position ofthe cylinder is reversed and the lever F is `fulcrumed on the inner sideof the brake-beam. The cylinder is also provided with the pipes a anda', as in p Fig. 1.

In the construction shown in Fig. 3 the brake-beams are at the innersides of the wheels and in the interior part of the truck incontradistinction to the constructions shown in Figs. 1 and 2,which havethe brakebeams at the ends. The connecting-rod G is replaced by apush-bar G', connected with the fulcrumed lever F in the mannerpreviously described. t

To apply the brake the piston C is moved by compressed air or vacuum inthe direction of the arrow w3, and thereby the pushrod` G moved in thedirection of the arrow, and the shoes on the brakes are pressedagainstthe rims of the corresponding wheels. As the entire brakeapparatus is supported by the brake-beam, it accommodates itself toperpendicular and lateral movements of the wheels independent of thebolster-timber` which holds the king-bolt. The power of the brake ismultiplied and increased, and with a single cylinder for each truckI amenabled to exert sutlicient power to etfectually brake any car.

Having th us described my invention, I claim as new and desire to secureby Letters Patent 1. The -combinatiomwith two brake-beams, of a cylinderor chamber on one beam, a pistonn in said Chamber, and a lever fulcrumedon the brake-beam carrying the cylinder and having one end connectedwith the piston in the cylinder, the opposite end part of said leverbeing connected by a bar or rod with the other brake-beam, substantiallyas set forth.

The oo|nbi1mtion,with two brake-beams, In testimony that I claim theforegoing as of a cylinder or chamber secured on one of my inventionIhave signed my name in presthe said brake-beams, a piston in saidoylinence of two subscribing witnesses.

der, and apivoted lever and a rod or bar for LOUIS P. LAXVRENCE. 5transmitting power from the brake-beam ezu- Vitnesses:

rying the cylinder or chamber to the other OSCAR F. GUNZ,

brake-beam, substantially as set forth. JOHN A. STRALEY.

